Embryo, NonmammalianOutpatient Clinics, HospitalEmbryo, MammalianAmbulatory Care FacilitiesBlastocystEmbryonic DevelopmentGene Expression Regulation, DevelopmentalVitellinsGastrulaCell AggregationDental ClinicsBlastomeresXenopus ProteinsEmbryonic Stem CellsCell DifferentiationCaenorhabditis elegansChick EmbryoTeratomaCarcinoma, EmbryonalPain ClinicsMitosisXenopusXenopus laevisOvumMolecular Sequence DataCell LineageTeratocarcinomaBlastulaCleavage Stage, OvumEndodermEmbryonal Carcinoma Stem CellsOocytesCaenorhabditis elegans ProteinsCells, CulturedNuclear Transfer TechniquesCell CycleCDC2 Protein KinaseStarfishCell DivisionCell LineMorphogenesisPregnancyTranscription FactorsTime FactorsZebrafishDipteraOctamer Transcription Factor-3Sea UrchinsZygoteQuailEmbryonic and Fetal DevelopmentIridovirusBase SequenceUrochordataTotipotent Stem CellsFertilizationSalamandridaeGastrulationPluripotent Stem CellsAmino Acid SequenceEctodermMesodermInsect Hormonescdc25 PhosphatasesRNA, MessengerCoturnixCell NucleusChimeraStem CellsCell Cycle ProteinsAmbulatory CareNeural CrestIn Situ HybridizationCyclin BPleurodelesMorulaBlastodermSignal TransductionCommunity Health CentersGerm CellsNuclear ProteinsCell MovementNotochordBody PatterningDNA-Binding ProteinsTranscription, GeneticDNAZebrafish ProteinsEmbryo LossMutationAnimals, Genetically ModifiedGenes, HelminthVenereologyTrophoblastsDrosophila ProteinsCell AdhesionSexually Transmitted DiseasesEmbryonic InductionHomeodomain ProteinsDrosophila